You are burning wood pellets. When you burn wood you produce ash. Some of the ash is extremely hard and hard to remove. What I do is remove the burn pot, take it into my shop and with a screwdriver and hammer, LIGHTLY tap on the hardened ash until the pot is clean. Should only take a few minutes. At the same time you can clean the glass. Even though it may burn very clean, nothing burns wood fuel without by-products...Good luck...Lee
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You are burning wood pellets. When you burn wood you produce ash. Some of the ash is extremely hard and hard to remove. What I do is remove the burn pot, take it into my shop and with a screwdriver and hammer, LIGHTLY tap on the hardened ash until the pot is clean. Should only take a few minutes. At the same time you can clean the glass. Even though it may burn very clean, nothing burns wood fuel without by-products...Good luck...Lee